“You can identify them by their fruit, by the way they act. Can you pick grapes from thorn bushes, or figs from thistles?”
Discernment is gift most Christians possess. You can usually tell, within a relatively short period of time, if someone actually follows Christ without even asking. It’s those who claim to follow Jesus but don’t bare the fruit of a follower you have to be wary of. Going to church doesn’t make someone a follower, a decision for Christ will produce a noticeable change.
Lord, I pray for those who do not know you and pray they will meet you through the actions of your followers or your tugging at their hearts.